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I recently visited Killarney and I thought it was a great system. As a tourist, the €2 was no big deal to have a cup for the whole week. Then I just returned it before I left and got the money back. They do this all over Germany and have branded cups for each town. It would be cool to see it more widely done elsewhere too.
I think it’s worth it. I use many of their services and they integrate nicely between each other and between different platforms. Plus, their customer service and tech support are excellent. I’m in the beta program and they’re always super responsive to bug reports and the like.